JP6387253B2 - Connector and blood purification apparatus to which the connector is attached - Google Patents

Description

  The present invention relates to a connector including a main body member capable of circulating a liquid and a joint member to which a hose for circulating the liquid can be connected, and a blood purification apparatus to which the connector is attached.

  A blood circuit for circulating a patient's blood extracorporeally at the time of blood purification treatment is usually composed of an arterial blood circuit and a venous blood circuit made of a flexible tube (hose). A blood purifier (dialyzer, etc.) for purifying extracorporeal blood is connected to each proximal end of the venous blood circuit, and an arterial puncture needle capable of puncturing the patient and A venous puncture needle is attached.

  In particular, in hemodialysis machines that perform hemodialysis treatment, a dialysate introduction line for introducing dialysate into a blood purifier (dialyzer), and a dialysate lead-out line for deriving dialysate discharged from the blood purifier And a dialyzer body (for example, a monitoring device) to which a dialysate supply line for supplying dialysate prepared to a predetermined concentration to the hemodialyzer is connected. For example, in the vicinity of the connection portion of the dialysate introduction line and the dialysate supply line with the dialyzer main body, a connector having a filter capable of trapping foreign matter in the dialysate is formed.

  Such a conventional connector is formed with a main body member in which a connecting part capable of connecting a hose for circulating a dialysate is formed, and a filter member capable of capturing foreign matter in the dialysate is disposed therein, and dialysis A joint member formed with a connecting portion capable of connecting a hose for circulating the liquid, a seal member disposed between the main body member and the joint member and sealable, and a threaded portion of the main body member meshing with and screwing. And a threaded member capable of connecting the body member and the joint member with a seal member interposed between the body member and the body member while being attached to the joint member. It was. In addition, since this prior art is not related to the literature known invention, there is no prior art document information to be described.

  However, in the above conventional connector, there is a risk that the force may act in the direction in which the screwing member is detached from the main body member, such as when the hose is attached to the dialysis device main body or when the hose is routed, There was a problem that the connection between the main body member and the joint member was loosened. In addition, the connection between the main body member and the joint member may be loosened due to, for example, the influence of heat, vibration, or the like due to long-term use. Therefore, if the connection between the main body member and the joint member is loosened, there is a problem that the sealing by the sealing member becomes poor and liquid leakage occurs.

  The present invention has been made in view of such circumstances, and it is possible to reliably maintain the screwing of the screwing member with respect to the main body member and to reliably prevent liquid leakage and the connecting tool. An object of the present invention is to provide a blood purification apparatus to which is attached.

The invention according to claim 1 is characterized in that a threaded portion is formed, a body member capable of circulating a liquid, a joint member formed with a connecting portion capable of connecting a hose for circulating a liquid, and the body member; A seal member disposed between the joint member and sealable, and a threaded portion that engages with a threaded portion of the main body member and can be screwed together are formed, and the main body member and the screw are attached to the joint member while being screwed. In the connecting tool including the screwing member capable of connecting the main body member and the joint member with the seal member interposed therebetween, the elastic member interposed between the screwing member and the main body member And a loosening prevention member that applies elastic force to the screwing member in a state where the screwing member is screwed to the main body member, and the elastic force becomes a rotational resistance of the screwing member to prevent loosening. equipped with a, One, the contact surface of the joint member and the body member, and wherein the concave and convex shape capable of fitting to conform circumferential direction in a state in which the body member and the joint member is connected are formed, respectively To do.

  According to a second aspect of the present invention, in the connector according to the first aspect, the loosening prevention member comprises an annular rubber member or resin member attached to the main body member or the screwing member. To do.

  According to a third aspect of the present invention, in the connecting tool according to the first or second aspect, the loosening prevention member is attached to a portion of the main body member on the terminal side of the screw portion.

According to a fourth aspect of the present invention, in the connection tool according to any one of the first to third aspects, the main body member is formed with a connection portion capable of connecting a hose for circulating the liquid, A filter member capable of catching foreign matter therein is disposed inside.

A fifth aspect of the present invention is a blood purification apparatus comprising a flow path to which a connection device according to any one of the first to fourth aspects is attached and through which a liquid can flow.

According to a sixth aspect of the present invention, in the blood purification apparatus according to the fifth aspect , the flow path comprises a dialysate flow path through which the dialysate is circulated, and the connector is attached to the dialysate flow path. Features.

A seventh aspect of the present invention is a blood purification device, wherein the connector according to any one of the first to fourth aspects constitutes a valve portion of a liquid feeding means for feeding a dialysate.

According to an eighth aspect of the present invention, in the blood purification apparatus according to the seventh aspect , the liquid feeding means comprises a metering pump that is disposed in the dialysate flow path and can feed dialysate, and the valve section. Comprises a check valve.

According to the first aspect of the present invention, the elastic member is provided between the screwing member and the main body member, and elastic force is applied to the screwing member in a state where the screwing member is screwed to the main body member. , Since the elastic member is provided with a loosening prevention member that can prevent the loosening due to the rotational resistance of the screwing member, the screwing of the screwing member to the main body member can be reliably maintained, and liquid leakage is surely prevented can do.
In addition, the contact surfaces of the joint member and the main body member are respectively formed with a concave shape and a convex shape that can be fitted and fitted in the circumferential direction in a state where the main body member and the joint member are connected. The screw engagement with the main body member can be more reliably maintained, and liquid leakage can be more reliably prevented.

  According to the invention of claim 2, since the loosening prevention member is composed of an annular rubber member or resin member attached to the main body member or the screwing member, it can be easily applied to an existing connector. At the same time, the screwing of the screwing member to the main body member can be more reliably maintained.

  According to the invention of claim 3, since the loosening prevention member is attached to a portion of the main body member on the terminal side of the screw portion, the screwing member is screwed in the process of screwing the screwing member to the main body member. The screwing operation from the initial stage until reaching the loosening prevention member can be easily performed, and at the end of the screwing when the screwing member reaches the loosening prevention member, the loosening prevention member generates elasticity to The screwing of the combined member to the main body member can be reliably maintained.

According to the invention of claim 4 , the main body member is formed with a connection portion that can connect a hose for circulating the liquid, and a filter member that can trap foreign matter in the liquid is disposed inside. In the process of circulating the liquid between the hose connected to the connection part of the main body member and the hose connected to the connection part of the joint member, the filter member can capture foreign matter in the liquid and leak the liquid. Can be reliably prevented.

According to the invention of claim 5 , it is possible to reliably prevent liquid leakage in the flow path in the blood purification apparatus.

According to the sixth aspect of the present invention, it is possible to reliably prevent leakage of the dialysate flow path in the blood purification apparatus.

According to the seventh aspect of the present invention, it is possible to reliably prevent liquid leakage from the valve portion of the liquid feeding means in the blood purification apparatus.

According to the eighth aspect of the present invention, it is possible to reliably prevent leakage of the check valve of the metering pump in the blood purification apparatus.

The front view which shows the connector which concerns on embodiment of this invention Longitudinal sectional view showing the connector Perspective view showing the connector Front view showing a main body member in the connector Exploded perspective view showing the connector Front view and side view showing a joint member in the connector The perspective view which shows the joint member in the connection tool Schematic showing a blood purification device to which the connection tool is attached External view showing a liquid feeding means (reciprocating pump) to which a connector according to another embodiment of the present invention is applied. XX sectional view in FIG. XI-XI sectional view taken on the line in FIG. The enlarged view which shows the valve part to which the connection tool which concerns on the liquid feeding means was applied

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The connector according to the present embodiment is formed in the middle of a hose (flexible tube) connected to a dialyzer body used in hemodialysis treatment, for example, and a dialysate as a liquid supplied to the dialyzer body and While allowing the dialysate derived from the blood purifier (dialyzer) to flow through the dialyzer body, it is possible to capture foreign substances in the dialysate, as shown in FIGS. The joint member 2 is mainly composed of a joint member 2, a seal member 3, a filter member 4, a screwing member 5, and a loosening prevention member 6.

  The main body member 1 has a connecting portion 1a that can be connected to a hose T1 (see FIG. 1) for circulating dialysate at one end portion, and an opposite end portion (an end to which the joint member 2 is connected). It is made of a resin member having a male screw portion 1b formed on the part side), and is formed in a hollow shape so that the dialysate can flow between one end side and the other end side. Further, a filter member 4 having a filter portion 4a capable of capturing foreign substances in the circulating dialysate is attached inside the main body member 1.

  The joint member 2 is formed with a connecting portion 2a that can connect a hose T2 (see FIG. 1) for circulating the dialysate, and a flange portion f is integrally formed at a portion to which the main body member 1 is connected. . The flange portion f of the joint member 2 is formed with an annular contact surface b that contacts the contact surface a (see FIG. 4) of the main body member 1 in a state where the joint member 2 and the main body member 1 are connected. In addition, the contact surface b has a concavo-convex portion 2b in which a plurality of concave and convex shapes are continuously formed in the circumferential direction.

  On the other hand, on the contact surface a of the main body member 1, a plurality of convex shapes 1 d (see FIG. 5) that can be fitted in the circumferential direction in conformity with the concave shape of the concavo-convex portion 2 b with the main body member 1 and the joint member 2 connected. 4 and 5) are integrally formed. In the present embodiment, the joint member 2 is formed with a concave and convex portion 2b in which the concave shape and the convex shape are continuous, and the convex shape 1d of the main body member 1 can be matched with the concave shape. The main body member 1 may be formed with a concave and convex portion having a continuous concave shape and convex shape, and a convex shape matching the concave shape may be formed on the joint member 2 side.

  Further, the joint member 2 has an attachment surface d on the connection side with the main body member 1, and the base end portion of the filter member 4 is attached to the attachment surface d in a state where the main body member 1 and the joint member 2 are connected. 4b can contact | abut. The fitting portion d of the joint member 2 has a concavo-convex shape, and the concavo-convex shape is formed on the base end portion 4b of the filter member 4 in a state where the main body member 1 and the joint member 2 are connected. It can match the shape.

  The seal member 3 includes a member that is disposed between the main body member 1 and the joint member 2 and can be sealed. In the present embodiment, the seal member 3 includes an O-ring. Specifically, as shown in FIG. 2, the seal member 3 is attached to the opening recess g of the main body member 1, and the pressing surface c formed on the joint member 2 in a state where the joint member 2 is connected. And can be sealed by being interposed between the main body member 1 and the joint member 2.

  The screw member 5 is formed of a substantially nut-shaped resin member having an opening 5b in the center, and a female screw portion 5a that engages with the male screw portion 1b of the main body member 1 and can be screwed is formed on the inner peripheral wall portion. The main body member 1 and the joint member 2 can be connected via the seal member 3 by being screwed with the main body member 1 while being attached to the joint member 2. That is, in the state where the contact surface b of the joint member 2 is brought into contact with the contact surface a of the main body member 1, the female screw portion 5a is inserted into the male screw portion 5a while inserting the opening 5b into the connection portion 2a side of the joint member 2. Since the joint member 2 is pressed in the axial direction (right direction in FIG. 2) with respect to the main body member 1 by being engaged with and screwed with the portion 1b, the flange portion while pressing the sealing member 3 with the pressing surface c. f is abutted against and connected to the end of the main body member 1 on the opening recess g side.

  In addition, it is preferable that the screw portion including the male screw portion 1b and the female screw portion 5a is difficult to loosen, such as loosening the inclination angle of the screw or using a single screw instead of a double screw. Further, in the present embodiment, the screwing member 5 is formed in a substantially nut shape, but may have another shape. In this case, a male screw part is formed on the screwing member and meshed with the male screw part. The female screw portion may be formed in the main body member 1.

  Here, the main body member 1 according to the present embodiment is formed with an attachment portion 1c for attaching the loosening prevention member 6. The loosening prevention member 6 is made of an elastic body interposed between the screwing member 5 and the main body member 1, and the screwing member 5 is screwed into the main body member 1 (that is, screwed into the male screw portion 1 b of the main body member 1. Elasticity can be imparted to the screwing member 5 in a state where the female screw part 5a of the connecting member 5 is engaged and screwed. That is, when the screwing member 5 is screwed to the main body member 1, the inner peripheral wall surface on the base end side (left end side in FIG. 2) of the screwing member 5 compresses the loosening prevention member 6, and the loosening prevention member 6 elasticity (restoring force) is generated, and the elasticity becomes the rotational resistance of the screwing member 5 (particularly, the rotational resistance in the direction of unscrewing), and loosening can be prevented.

  Further, the loosening prevention member 6 according to this embodiment is made of an annular rubber member (which may be either natural rubber or synthetic rubber) attached to the attachment portion 1c of the main body member 1. However, for example, an annular rubber member attached to the screwing member 5 may be used. The loosening prevention member 6 is not limited to an annular member made of rubber, and is attached to the main body member 1 or the screwing member 5, and is elastic to the screwing member 5 while being screwed to the main body member 1. As long as it can be applied, it is not limited to a rubber member, and may be a resin member (for example, a soft resin), or a member other than an annular member (for example, a single member such as a C-shape, or It may be a member in which a plurality of members are disposed across the joint between the main body member 1 and the screwing member 5.

  Furthermore, the loosening prevention member 6 according to the present embodiment is attached to a portion of the main body member 1 on the terminal side of the male screw portion 1b (a portion on the left side of the portion where the male screw portion 1b is formed in FIG. 2). That is, the attachment portion 1c of the main body member 1 is formed on the terminal end side of the male screw portion 1b from the portion where the male screw portion 1b is formed, and the loosening prevention member 6 is attached to the attachment portion 1c. The side where the female screw portion 5a of the fitting member 5 begins to engage with the male screw portion 1b of the main body member 1 is referred to as the start end side of the male screw portion 1b, and the opposite side (that is, the side on which the fitting is completed) of the male screw portion 1b. It shall be called the end side.

  According to the embodiment, the elastic member is formed between the screw member 5 and the main body member 1 and is elastic with respect to the screw member 5 in a state where the screw member 5 is screwed to the main body member 1. Therefore, the elastic force of the loosening prevention member 6 becomes rotational resistance of the screwing member 5 (particularly, rotational resistance in the direction of unscrewing) to prevent loosening. The screwing of the screwing member 5 to the main body member 1 can be reliably maintained, and liquid leakage can be reliably prevented.

  Moreover, since the loosening prevention member 6 according to the present embodiment is composed of an annular rubber member or resin member attached to the main body member 1 or the screwing member 5, it can be easily applied to existing connectors. In addition, the screwing of the screwing member 5 to the main body member 1 can be more reliably maintained. In this embodiment, the loosening prevention member 6 is a separate member from the main body member 1 or the screwing member 5, but is integrated with the main body member 1 or the screwing member 5 by insert molding or the like, for example. It may be what was done.

  Furthermore, since the loosening prevention member 6 according to the present embodiment is attached to a portion of the main body member 1 on the terminal side of the male screw portion 1b, in the process of screwing the screwing member 5 into the main body member 1, the screwing member It is possible to easily perform the screwing operation from the initial stage of the screwing 5 until reaching the loosening prevention member 6, and at the screwing final stage when the screwing member 5 reaches the loosening prevention member 6 (the screwing is almost completed). In this state, elasticity by the loosening prevention member 6 is generated, and the screwing of the screwing member 5 to the main body member 1 can be reliably maintained.

  Still further, according to the present embodiment, the contact surfaces a and b of the main body member 1 and the joint member 2 can be fitted in the circumferential direction in a state where the main body member 1 and the joint member 2 are connected. Since the concave shape and the convex shape are respectively formed, in addition to the rotational resistance due to the elasticity of the loosening prevention member 6, it is possible to prevent the screw member 5 from rotating in the loosening direction by fitting the concave shape and the convex shape, The screwing of the screwing member 5 to the main body member 1 can be more reliably maintained, and liquid leakage can be more reliably prevented.

  In addition, the main body member 1 according to the present embodiment is formed with a connection portion 1a that can connect a hose T1 for circulating liquid, and a filter member 4 that can trap foreign matter in the liquid. Therefore, in the process of circulating the dialysate (liquid) between the hose T1 connected to the connection part 1a of the main body member 1 and the hose T2 connected to the connection part 2a of the joint member 2, the filter member 4 dialyzes. Foreign substances in the liquid can be captured and liquid leakage can be reliably prevented.

Next, a blood purification apparatus to which the connector K according to the above embodiment is attached will be described.
The blood purification apparatus according to the present embodiment includes a hemodialysis apparatus for performing hemodialysis treatment on a patient. As shown in FIG. 8, a blood pump 10 is disposed and connected to a dialyzer 11 (blood purification means). Blood circuit 9 (arterial side blood circuit and venous side blood circuit), and dialyser main body 13 having a dialysate introduction line (L1a, L1b, L1c) and a dialysate discharge line (L2a, L2b, L2c). It is mainly composed. In the figure, reference numeral 12 denotes an air trap chamber connected to the blood circuit 9.

  The dialyzer 11 is for purifying blood, and is connected to the arterial blood circuit and the venous blood circuit constituting the blood circuit 9, respectively, and to the dialysate introduction line L1b and the dialysate discharge line L2b. By driving the blood pump 10, the patient's blood collected from the arterial puncture needle α is extracorporeally circulated in the blood circuit 9, purified and dehydrated by the dialyzer 11, and then the venous puncture needle. It returns to the patient from β.

  The dialysate introduction line L1a is composed of a flow path for introducing a dialysate prepared at a predetermined concentration into the dialyzer body 13, and the dialysate introduction line L1b is a dialysate introduced into the dialyzer body 13. It consists of a flow path for introduction into the dialyzer 11. When the dialysate introduction lines L1a and L1b are connected to the dialyzer main body 13, the dialysate introduction lines (L1a and L1b) and the dialysate introduction line L1c constituting the piping in the dialyzer main body 13 communicate with each other. The dialysate can be circulated.

  The dialysate discharge line L2b includes a flow path for discharging dialysate (dialyzed drainage) from the dialyzer 11 into the dialyzer main body 13. The dialysate discharge line L2a is discharged into the dialyzer main body 13. It consists of a flow path for discharging the dialyzed solution to the outside. When the dialysate discharge lines L2a and L2b are connected to the dialyzer main body 13, the dialysate discharge lines (L2a and L2b) and the dialysate discharge line L2c constituting the pipe in the dialyzer main body 13 communicate with each other. The dialysate can be circulated.

  Further, the dialysate introduction line L1c and the dialysate discharge line L2c in the dialyzer main body 13 are fed with a dialysate adjusted to a predetermined concentration to the dialyzer 11 and dialysate from the dialyzer 11 (dialysis drainage fluid). ) Is discharged to the outside as a dual pump 7 (reciprocating pump). In the dialyzer body 13, a plurality of bypass lines and solenoid valves are provided at arbitrary positions, and a dewatering pump 8 is connected to the bypass line L3 that bypasses the drain side pump chamber of the duplex pump 7. Has been.

  Here, the connection tool K according to the present embodiment is attached to a flow path (flow path through which liquid can be circulated) included in the hemodialysis apparatus (blood purification apparatus). As shown in FIG. 8, it is attached to a dialysate introduction line L1a and a dialysate discharge line L2b through which the dialysate flows. Thereby, the liquid leakage of the dialysate flow path (dialysate introduction line L1a and dialysate discharge line L2b) in the hemodialysis apparatus (blood purification apparatus) can be reliably prevented. The connection tool K may be attached to another flow path (for example, the dialysate introduction line L1b or the dialysate discharge line L2a) provided in the hemodialysis apparatus (blood purification apparatus).

Next, another embodiment according to the present invention will be described.
The connection device according to the present embodiment constitutes a valve portion of a liquid feeding means for feeding dialysate, and the liquid feeding means is disposed in the dialyzer body 13 and the dialysate is supplied to the dialyzer 11 (FIG. 8). And a dual pump 7 (metering pump) for discharging the drained liquid from the dialyzer 11. As shown in FIGS. 9 to 12, the compound pump 7 has a liquid supply side suction port C1 that can suck dialysate into the liquid supply side pump chamber P1, the drain side pump chamber P2, and the liquid supply side pump chamber P1. A supply side discharge port C2 that can discharge the dialysate in the supply side pump chamber P1, a drain side suction port C3 that can suck the dialysate into the drain side pump chamber P2, and the drain side pump A drain side discharge port C4 that can discharge the dialysate in the chamber P2, a motor M as a driving means, a plunger 14 as a reciprocating means, and check valves (J1 to J4) as valve parts of the liquid feeding means, Consists mainly of.

  The liquid supply-side pump chamber P1 accommodates a predetermined volume that can circulate dialysate (liquid made of an electrolyte) sucked from the liquid supply-side suction port C1 and discharge it from the liquid supply-side discharge port C2 by reciprocating movement of the plunger 14. Consists of space. Similarly, the drain side pump chamber P2 includes a storage space having a predetermined capacity that allows the dialysate sucked from the drain side suction port C3 to flow and be discharged from the drain side discharge port C4 by the reciprocation of the plunger 14. . Further, the liquid supply side suction port C1 and the liquid supply side discharge port C2 are respectively connected to the pipes constituting the dialysate introduction line L1c, and the drainage side suction port C3 and the drainage side discharge port C4 are respectively It is connected to a pipe constituting the dialysate discharge line L2c.

  The plunger 14 can be reciprocated with respect to the liquid supply side pump chamber P1 and the liquid discharge side pump chamber P2 by the motor M, and from the liquid supply side suction port C1 and the liquid discharge side suction port C3 by the reciprocation. The dialysate can be sucked into the liquid supply side pump chamber P1 and the drain side pump chamber P2, respectively, and the dialysate can be discharged from the liquid supply side discharge port C2 and the drain side discharge port C4, respectively.

  More specifically, as shown in FIGS. 10 and 11, a cam member 15 is attached to the output shaft Ma of the motor M, and the cam member 15 has a position different from the axis of the output shaft Ma ( A cam portion 15a is formed to protrude at a position eccentric with respect to the rotation center. The cam member 15 is positioned in a recess 14 a formed in the plunger 14 in a state where the motor M is assembled. Further, a block slider 16 is attached to the cam portion 15a, and when the motor M is driven, the block slider 16 presses the plunger 14 in the longitudinal direction so as to reciprocate in the left-right direction in FIG. It has become.

  The check valves (J1, J2) are composed of a non-conductive valve (valve made of an insulating material) having a function of keeping the flow of dialysate in one direction (upward in FIG. 11) and preventing backflow. The liquid supply side pump chamber P1 is provided between the chamber P1 and the flow path on the liquid supply side suction port C1 side and the flow path on the liquid supply side discharge port C2 side. It is configured to be openable and closable in accordance with a change in fluid pressure, to allow the flow of dialysate in the open state, and to block the flow of dialysate in the closed state.

  Similarly, the check valves (J3, J4) are non-conductive valves (valves made of an insulating material) having a function of keeping the dialysis fluid flow in one direction (upward in FIG. 11) and preventing backflow. The drain side pump chamber is disposed between the liquid side pump chamber P2 and the flow path on the drain side suction port C3 side and the flow path on the side of the drain side discharge port C4, and is generated as the plunger 14 reciprocates. The dialysis fluid can be opened and closed in accordance with a change in the fluid pressure in P1, the dialysis fluid is allowed to flow in the open state, and the dialysis fluid is blocked in the closed state.

  Thus, when the motor M is driven, the plunger 14 is displaced to the left in the drawing and reaches the end (displacement end) on the drain side pump chamber P2 side, and the check valve J1 on the liquid supply side suction port C1 side is reached. The check valve J4 on the drain side discharge port C4 side is opened, and the check valve J2 on the supply side discharge port C2 side and the check valve J3 on the drain side suction port C3 side are closed. When the plunger 14 reaches the left end (displacement end) in the figure, all the check valves (J1 to J4) are closed.

  Thereafter, in the process in which the plunger 14 is displaced to the right side in the drawing and reaches the end (displacement end) on the liquid supply side pump chamber P1 side, the check valve J2 on the liquid supply side discharge port C2 side and the drain side suction port C3 side The check valve J3 is opened, and the check valve J1 on the liquid supply side suction port C1 and the check valve J4 on the drain side discharge port C4 are closed. When the plunger 14 reaches the right end (displacement end) in the figure, all the check valves (J1 to J4) are closed. Thereafter, as the plunger 14 reciprocates, the check valves (J1 to J4) similar to the above are opened and closed.

  Here, as shown in FIG. 12, the connector according to this embodiment is a joint formed with a main body member 17 in which a screw portion 17a is formed and a connection portion 18a in which a hose for allowing a liquid to flow is connected. A member 18, a seal member 19 disposed between the body member 17 and the joint member 18 and sealable, and a screw portion 20 a that can be engaged with and screwed with the screw portion 17 a of the body member 17 are formed. The screw member 20 that can be connected to the main body member 17 and the joint member 18 through the seal member 19 by screwing with the main body member 17 while being attached to the joint member 18, and the screw member 20 and the main body member And a connection tool including a loosening prevention member 21 that is made of an elastic body interposed between the screw member 17 and can provide elasticity to the screw member 20 in a state where the screw member 20 is screwed to the main body member 17. The That.

  According to the above embodiment, it is possible to reliably prevent the liquid leakage of the valve portion of the liquid feeding means in the hemodialysis apparatus (blood purification apparatus). Specifically, since the connector according to the present embodiment constitutes check valves J1 to J4 (valve parts) of a metering pump (double pump) for feeding dialysate, in a hemodialysis apparatus (blood purification apparatus) Liquid leakage from the check valve of the metering pump can be reliably prevented. In addition, although the connection tool which concerns on this embodiment is applied to all the check valves J1-J4, you may make it apply to either of the check valves J1-J4.

As mentioned above, although this embodiment was described, this invention is not limited to this, While the thread part is formed, the connection part which can connect the main body member which can distribute | circulate a liquid, and the hose for distribute | circulating a liquid The formed joint member, a seal member disposed between the main body member and the joint member and sealable, and a threaded portion that meshes with the threaded portion of the main body member and can be screwed are formed. A screw member that can be connected to the main body member and the joint member by interposing a seal member by screwing with the main body member while being attached, and an elastic body that is interposed between the screw member and the main body member. And a loosening prevention member that provides elasticity to the screwing member in a state where the screwing member is screwed to the main body member, and the elastic force becomes a rotational resistance of the screwing member to prevent loosening , and , Joint members and The contact surface of the body member, as long as fitting the concave and convex shape is formed respectively capable of fitting to match the circumferential direction in a state in which the body member and the joint member is connected, other forms It can also be applied to connectors.

Further, the loosening prevention members (6, 21) according to the present embodiment are attached to a portion of the main body member (1, 17) on the terminal end side of the screw portion, but the screwing members (5, 20) and the main body member. (1, 17) and an elastic body interposed between the screw member (5, 20) and the screw member (5, 20) to the main body member (1, 17). As long as it can give elasticity, it may be attached to another part .

  Further, unlike the other embodiments, the main body member may not include the filter member, and members (sensors or the like) that perform other functions may be disposed in the main body member. In the present embodiment, the liquid to be circulated is the dialysate, but other liquids may be circulated.

A threaded portion is formed, and a main body member capable of circulating a liquid, a joint member formed with a connecting portion capable of connecting a hose for circulating the liquid, and the main body member and the joint member are disposed. A seal member that can be sealed and a threaded portion that meshes with a threaded portion of the main body member and is screwed to the main body member while being attached to the joint member, thereby interposing the sealing member. A connector having a screwing member capable of connecting the main body member and the joint member, and comprising a resilient body interposed between the screwing member and the main body member, and the screwing member screwed into the main body member Provided with an anti-loosening member that provides elastic force to the screwing member and the elastic force becomes a rotational resistance of the screwing member to prevent loosening , and the contact surfaces of the joint member and the main body member include Body member and If the blood purification device matches to connect concave and convex capable of fitting in the circumferential direction are formed respectively instrument and its connector is attached in a state of Wei hand member is connected, the external shape is different The present invention can also be applied to a device or other devices to which other functions are added.

DESCRIPTION OF SYMBOLS 1 Main body member 2 Joint member 3 Seal member 4 Filter member 5 Screwing member 6 Loosening prevention member 7 Duplex pump (liquid feeding means)
DESCRIPTION OF SYMBOLS 8 Water removal pump 9 Blood circuit 10 Blood pump 11 Dializer 12 Air trap chamber 13 Dialyzer main body 14 Plunger 15 Cam member 16 Block slider 17 Main body member 18 Joint member 19 Seal member 20 Screwing member 21 Loose prevention member 21

Claims (8)

A threaded portion is formed, and a main body member capable of circulating a liquid,
A joint member formed with a connecting portion capable of connecting a hose for circulating liquid;
A seal member disposed between the body member and the joint member and sealable;
A threaded portion that can be engaged with and screwed with the threaded portion of the main body member is formed, and is screwed with the main body member while being attached to the joint member, so that the main body member and the joint are interposed with the seal member interposed therebetween. A threaded member capable of connecting the member;
In the connecting device comprising:
Together made of an elastic body interposed between said threaded member and the body member, the threaded member is a resilient granted with respect to the screw member in a state screwed in the body member, the elasticity the screw A loosening prevention member capable of preventing the loosening as a rotational resistance of the joint member, and the contact surface of the joint member and the main body member coincide with each other in a state in which the main body member and the joint member are connected to each other in the circumferential direction A connector having a concave shape and a convex shape that can be fitted to each other .   2. The connector according to claim 1, wherein the loosening prevention member is formed of an annular rubber member or resin member attached to the main body member or the screwing member.   The connector according to claim 1, wherein the loosening prevention member is attached to a portion of the main body member on a terminal side of the screw portion. The said main body member is formed with a connection part capable of connecting a hose for circulating a liquid and a filter member capable of capturing foreign substances in the liquid disposed therein. The connector according to any one of 3 . A blood purification apparatus comprising a flow path to which the connection tool according to any one of claims 1 to 4 is attached and through which a liquid can flow. 6. The blood purification apparatus according to claim 5 , wherein the flow path comprises a dialysate flow path for allowing dialysate to flow, and the connector is attached to the dialysate flow path. The blood purification apparatus, wherein the connector according to any one of claims 1 to 4 constitutes a valve portion of a liquid feeding means for feeding dialysate. 8. The blood purification device according to claim 7 , wherein the liquid feeding means comprises a metering pump disposed in the dialysate flow path and capable of feeding dialysate, and the valve section comprises a check valve. apparatus.

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